CN112886695A - Uninterruptible power supply system - Google Patents

Uninterruptible power supply system Download PDF

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Publication number
CN112886695A
CN112886695A CN201911205184.4A CN201911205184A CN112886695A CN 112886695 A CN112886695 A CN 112886695A CN 201911205184 A CN201911205184 A CN 201911205184A CN 112886695 A CN112886695 A CN 112886695A
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CN
China
Prior art keywords
switch
voltage
power supply
signal
output
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Pending
Application number
CN201911205184.4A
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Chinese (zh)
Inventor
江景渊
周明伟
陈长泰
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Delta Electronics Inc
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Delta Electronics Inc
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Publication date
Application filed by Delta Electronics Inc filed Critical Delta Electronics Inc
Priority to CN201911205184.4A priority Critical patent/CN112886695A/en
Priority to EP20184627.6A priority patent/EP3829025A1/en
Priority to US16/923,749 priority patent/US20210167626A1/en
Publication of CN112886695A publication Critical patent/CN112886695A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
    • H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
    • H02H3/243—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for DC systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00308—Overvoltage protection

Abstract

A non-power-off power supply system is connected with a load and supplies power to the load through a power supply unit or a battery unit. The uninterrupted power supply system comprises an output end, a first switch, a second switch, a third switch, a controller and a protection circuit. The controller controls the first switch and the third switch to be turned on and the second switch to be turned off during a first period when the power supply unit supplies power to the load, and controls the first switch to be turned off and the second switch and the third switch to be turned on during a second period when the battery unit supplies power to the load, wherein the third switch is turned off through at least one of the protection circuit and the controller during the first period if at least one of the power supply unit and the output terminal is abnormal or during the second period if at least one of the battery unit and the output terminal is abnormal.

Description

Uninterruptible power supply system
Technical Field
The present invention relates to an uninterruptible power supply system, and more particularly, to an uninterruptible power supply system with software and hardware protection.
Background
Medical institutions require higher standards in terms of power protection systems than commercial or industrial uses. Healthcare facilities must be equipped with a stable power supply to allow operation of a myriad of important healthcare devices. For example, Magnetic Resonance Imaging (MRI), Computed Tomography (CT) scanners, X-ray, gas analyzers, ultrasound and radiography devices all require the installation of an uninterruptible power system to ensure their operational performance. Because the operation of part of medical facilities is related to the life of a patient, when the medical facilities cannot operate due to abnormal power supply, the medical facilities need to be known in real time for subsequent processing, and therefore, it is important to know the abnormal power supply of the uninterruptible power system in real time.
Disclosure of Invention
The invention aims to provide a power supply system without power interruption, which solves the problems in the prior art.
In order to achieve the above object, the uninterruptible power supply system according to the present invention is connected to a load, and the load is supplied with power through a power supply unit or a battery unit. The uninterrupted power supply system comprises an output end, a first switch, a second switch, a third switch, a controller and a protection circuit. The output end is coupled with a load. The first switch has a first terminal and a second terminal coupled to the power supply unit. The second switch has a first terminal and a second terminal coupled to the battery cell. The third switch has a first end coupled to the first end of the first switch and the first end of the second switch, and a second end coupled to the output end. The controller controls the first switch and the third switch to be turned on and the second switch to be turned off during a first period when the power supply unit supplies power to the load, and controls the first switch to be turned off and the second switch and the third switch to be turned on during a second period when the battery unit supplies power to the load, wherein the third switch is turned off through at least one of the protection circuit and the controller during the first period if at least one of the power supply unit and the output terminal is abnormal or during the second period if at least one of the battery unit and the output terminal is abnormal.
The uninterrupted power supply system can improve the reliability and safety of power supply.
For a further understanding of the technology, means, and advantages of the invention adopted to achieve the intended purpose, reference should be made to the following detailed description of the invention and to the accompanying drawings, which are included to provide a further understanding of the purpose, features, and characteristics of the invention, and to the accompanying drawings, which are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.
Drawings
FIG. 1: is a system block diagram of a first embodiment of the uninterruptible power supply system of the invention.
FIG. 2: is a system block diagram of a second embodiment of the uninterruptible power supply system of the invention.
FIG. 3: is a circuit block diagram of the protection circuit of the present invention.
FIG. 4: the invention is a circuit block diagram for controlling the third switch in a hardware and software mode.
FIG. 5: the invention is a circuit block diagram for controlling an abnormality indication unit in a hardware manner.
FIG. 6: the invention is a circuit block diagram for controlling an abnormality indication unit in a software mode.
FIG. 7: the invention is a circuit block diagram for detecting output current of an output end in a hardware and software mode.
FIG. 8: the invention is a circuit diagram for converting the output current detected by an output end into a detection signal in a software mode.
Description of reference numerals:
10 power supply unit
20 cell unit
30 output terminal
11 first switch
12 second switch
13 third switch
40 controller
50 abnormality indication unit
61 first power converter
62 second power converter
70 protective circuit
Ps1 first supply path
Ps2 second supply path
VPUOutput power supply
VBATOutput power supply
VMCUVoltage of
VBAZVoltage of
SW1 first switch signal
SW2 second switch signal
SW3 third switch signal
SW6 sixth switching Signal
Qsw31 first control switch
Qsw32 second control switch
QBAZThird control switch
Rh first resistor
Rs second resistor
pu _ vs1 first voltage signal
bat _ vs1 second voltage signal
out _ vs1 third Voltage Signal
Iout output current
out _ is current signal
out _ REF third reference Voltage
pu _ REF second reference voltage
Isen first current signal
i _ REF reference current
Voltage of Vh
Vs voltage
Second output signal of Spu _ uvp
Spu _ ovp first output signal
Third output signal of Sbat _ uvp
Sout _ uvp fourth output signal
Sout _ ocp fifth output signal
pu _ vs2 first voltage signal
bat _ vs2 second voltage signal
out _ vs2 third Voltage Signal
Detailed Description
The technical contents and detailed description of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a system block diagram of a uninterruptible power supply system according to a first embodiment of the present invention. The uninterruptible power supply system of the present invention provides uninterruptible power to the output terminal 30 through the Power Unit (PU) 10 or the battery unit 20. The power supply unit 10 may be an alternating current to direct current converter (AC/DC converter) for converting received alternating current (e.g., commercial power) into direct current. The output terminal 30 is coupled to a load receiving a dc power. Generally, when the input power (e.g. commercial power) received by the power supply unit 10 is normal, the uninterruptible power supply system is powered by the power supply unit 10. When the input power is abnormal, the uninterruptible power supply system is switched to the battery unit 20 for supplying power. The uninterruptible power supply system includes a first power supply path Ps1, a second power supply path Ps2, a first switch 11, a second switch 12, a third switch 13, a controller 40, and a protection circuit 70.
The first power supply path Ps1 is coupled between the power supply unit 10 and the output terminal 30, that is, the first power supply path Ps1 is the output power V of the transmission power supply unit 10PUThe power supply path of (1). The second power supply path Ps2 is coupled between the battery cell 20 and the output terminal 30, that is, the second power supply path Ps2 is used for transmitting the output power V of the battery cell 20BATThe power supply path of (1).
The first switch 11 is disposed on the first power supply path Ps1, and has one end coupled to the power supply unit 10. The second switch 12 is disposed on the second power supply path Ps2, and has one end coupled to the battery cell 20. The third switch 13 is disposed on the first power path Ps1 and the second power path Ps2, and has one end coupled to the first switch 11 and the second switch
The second switch 12 has the other end coupled to the output terminal 30. That is, the third switch 13 is disposed on a common path of the first power supply path Ps1 and the second power supply path Ps 2. The first switch 11, the second switch 12 and the third switch 13 may be semiconductor power switches, such as MOSFETs, BJTs, IGBTs, SCRs … …, etc., or mechanical switches, such as Relay voltage (Relay) … …, etc., without limiting the present invention.
In the present embodiment, when the load is powered by the power supply unit 10, the controller 40 controls the first switch 11 to be turned on by the first switch signal SW1 and the third switch 13 to be turned on by the third switch signal SW3 and the second switch 12 to be turned off by the second switch signal SW 2. When the load is powered by the battery cell 20, the controller 40 controls the first switch 11 to be turned off by the first switch signal SW1 and controls the second switch 12 to be turned on by the second switch signal SW2 and controls the third switch 13 to be turned on by the third switch signal SW 3. The third switch 13 may be turned off by at least one of the protection circuit 70 and the controller 40 when the first abnormal condition occurs in the power supply unit 10 or the third abnormal condition occurs in the output terminal 30 during the power supply to the load by the power supply unit 10, or when the second abnormal condition occurs in the battery unit 20 or the third abnormal condition occurs in the output terminal 30 during the power supply to the load by the battery unit 20.
The first abnormal condition may include occurrence of an under voltage abnormality (undervoltage abnormality) or an over voltage abnormality (over voltage abnormality) of the power supply unit 10; the second abnormal condition may include an under-voltage abnormality of the battery cell 20; the third abnormal condition may include an under-voltage or over-current abnormality (over current abnormality) occurring at output 30.
In some embodiments, the controller 40 is, for example, a Central Processing Unit (CPU), or other Programmable Microprocessor (Microprocessor), Digital Signal Processor (DSP), Programmable controller, Application Specific Integrated Circuit (ASIC), Programmable Logic Device (PLD), or the like. The protection circuit 70 is, for example, an analog circuit including a plurality of operational amplifiers, but it is not limited to the invention.
The uninterruptible power supply system of the present invention has the software (i.e., the controller 40) and the hardware (i.e., the protection circuit 70) protection, so that the uninterruptible power supply system has the double protection effect. In other words, if the power supply system is not powered off and an abnormality occurs, even if one of the controller 40 and the protection circuit 70 is abnormal, the other one can determine the occurrence of the abnormality and perform corresponding processing in real time, so as to avoid the occurrence of an accident caused by the fact that the load at the rear end cannot operate normally due to the abnormal power supply but cannot be determined. The uninterruptible power supply system further includes an abnormality indication unit 50 coupled to the controller 40 and the protection circuit 70. The abnormal indication unit 50 is used to indicate the occurrence of an abnormal condition when the abnormal condition occurs in the power supply unit 10, the battery unit 20 or the output terminal 30. The abnormality indication unit 50 may be used for indication through sound, light or other forms, and in one embodiment, the abnormality indication unit 50 may be a buzzer (buzzer), and when an abnormal condition occurs, the buzzer may be controlled to sound, so that an operator or a user can know the abnormal condition.
In the uninterruptible power supply system, the controller 40 and the abnormality indication unit 50 are output power V provided by the power supply unit 10PUOr the output power V provided by the battery unit 20BATThe power is supplied. Specifically, when the power supply unit 10 supplies power, the power supply unit 10 supplies the output power VPUThe output power V is supplied through the first power converter 61PUConverted to a voltage V usable by the controller 40MCUFor example, but not limited to, 3.3 volts, and an output power supply V provided by the power supply unit 10PUThe output power V is supplied through the second power converter 62PUConverted into a voltage V usable by the abnormality indication unit 50BAZSuch as, but not limited to, 16 volts. Similarly, when battery unit 20 is powered, output power V provided by battery unit 20BATThe output power V is supplied through the first power converter 61BATConverted to a voltage V usable by the controller 40MCUFor example, but not limited to, 3.3 volts, and an output power source V provided by the battery unit 20BATThe output power V is supplied through the second power converter 62BATConverted into a voltage V usable by the abnormality indication unit 50BAZSuch as, but not limited to, 16 volts. Thereby, the controller 40 and the abnormality indication unit 50 can maintain normal operation by the power supply of the power supply unit 10 or the battery unit 20.
The type of the abnormal protection of the invention comprises a first abnormal condition that the power supply unit 10 generates under-voltage abnormality or over-voltage abnormality; a second abnormal condition in which an under-voltage abnormality occurs in the battery unit 20; a third abnormal condition of an under-voltage abnormality or an over-current abnormality occurs at the output terminal 30. Please refer to fig. 3, which is a block diagram of the protection circuit of the present invention. The hardware protection method is mainly to directly generate a control signal corresponding to the abnormal condition through a hardware circuit, and control the third switch 13 to turn off, so that the power supply unit 10 or the battery unit 20 is disconnected from the output terminal 30, thereby preventing damage to the system caused by the abnormal condition. As shown in fig. 3, the control signals are the second output signal Spu _ uvp and the first output signal Spu _ ovp corresponding to the occurrence of the under-voltage abnormality and the over-voltage abnormality of the power supply unit 10, the third output signal Sbat _ uvp corresponding to the occurrence of the under-voltage abnormality of the battery unit 20, and the fourth output signal Sout _ uvp and the fifth output signal Sout _ ocp corresponding to the occurrence of the under-voltage abnormality and the over-current abnormality of the output terminal 30, respectively, according to the correspondence relationship listed in the following table.
Origin of abnormality Abnormal class Corresponding control signal
Power supply unit Occurrence of overvoltage abnormality First output signal Spu _ ovp
Power supply unit Occurrence of under-voltage abnormality Second output signal Spu _ uvp
Battery unit Occurrence of under-voltage abnormality Third output signal Sbat _ uvp
Output end Occurrence of under-voltage abnormality Fourth output signal Sout _ uvp
Output end Occurrence of overcurrent abnormality Fifth output signal Sout _ ocp
As shown in fig. 3, the control signal corresponding to the abnormal type is generated by the protection circuit 70. Specifically, the detection of the occurrence of the under-voltage abnormality in the power supply unit 10 is performed by outputting the power supply V through a voltage dividing circuit (shown in fig. 1) provided on the power supply unit 10 sidePUThe divided first voltage signal pu _ vs1 is compared with the second reference voltage pu _ REF by a comparing unit (e.g., an operational amplifier) of the protection circuit 70. If the divided first voltage signal pu _ vs1 is smaller than the second reference voltage pu _ REF (or a voltage obtained by dividing the second reference voltage pu _ REF), it is detected that the power unit 10 has an under-voltage abnormality, and at this time, the comparing unit outputs a high-level signal, and starts a corresponding latch line (latch line) in the protection circuit 70, so that the protection circuit 70 outputs the second output signal Spu _ uvp with a high level.
Referring to fig. 4, it is a block diagram of a circuit for controlling the third switch in hardware and software according to the present invention. The second output signal Spu _ uvp with high level controls the first control switch Qsw31 to be turned on, so that the second control switch Qsw32 is correspondingly turned off, and therefore, the third switch 13 is controlled to be turned off, so that when an under-voltage abnormality occurs in the power unit 10, the third switch 13 is turned off, and the power unit 10 with abnormal under-voltage is prevented from supplying power to the system. In addition, refer to fig. 5, which is a block diagram of a circuit for controlling the abnormality indication unit in a hardware manner according to the present invention. When the power supply unit 10 has an under-voltage abnormality, the high-level second output signal Spu _ uvp controls the third control switch Q simultaneouslyBAZOn, the abnormal indication unit 50 (for example, a buzzer) sounds to inform an operator that the power supply unit 10 is under-voltage abnormal.
Similarly, the detection of the overvoltage abnormality occurring in the power supply unit 10 is also performed by comparing the obtained first voltage signal pu _ vs1 with a first reference voltage (e.g. 10 volts) by using one of the comparison units of the protection circuit 70 through a voltage division circuit (shown in fig. 1) provided on the power supply unit 10 side. If the divided first voltage signal pu _ vs1 is greater than the first reference voltage 10 volts (or the first reference voltage 10 volts is divided again), the comparator outputs a high level signal when detecting that the power unit 10 has an overvoltage abnormality, and activates the corresponding latch circuit in the protection circuit 70, so that the protection circuit 70 outputs the first output signal Spu _ ovp with a high level to the first control switch Qsw 31. The following operations can be referred to the previous embodiments and are not described herein.
Similarly, the detection of the occurrence of the under-voltage abnormality of the battery cell 20 is performed by comparing the obtained second voltage signal bat _ vs1 with a reference voltage (for example, 10 volts) by using one of the comparison units of the protection circuit 70, through a voltage divider circuit (shown in fig. 1) provided on the battery cell 20 side. If the divided second voltage signal bat _ vs1 is smaller than the reference voltage 10 volts (or the reference voltage 10 volts is divided into two), it is detected that the battery unit 20 has an under-voltage abnormality, and therefore, hardware protection needs to be activated, at this time, the comparing unit outputs a high-level signal, and activates the corresponding latch line in the protection circuit 70, so that the protection circuit 70 outputs a third output signal Sbat _ uvp with a high level to the first control switch Qsw 31. The following operations can be referred to the previous embodiments and are not described herein.
Similarly, the detection of the under-voltage abnormality at the output terminal 30 is performed by a voltage divider circuit (as shown in fig. 1) disposed at the output terminal 30, and the obtained third voltage signal out _ vs1 is compared with the third reference voltage out _ REF by one of the comparison units of the protection circuit 70. If the divided third voltage signal out _ vs1 is smaller than the third reference voltage out _ REF (or the voltage obtained by dividing the third reference voltage out _ REF), the comparator unit outputs a high level signal when detecting that the output terminal 30 has an under-voltage abnormality, and starts a corresponding latch line in the protection circuit 70, so that the protection circuit 70 outputs a fourth output signal Sout _ uvp with a high level to the first control switch Qsw 31. The following operations can be referred to the previous embodiments and are not described herein.
The detection of the overcurrent abnormality at the output terminal 30 is performed by a current detection circuit (as shown in fig. 7, which is a block diagram of the present invention that detects the output current at the output terminal in a hardware or software manner) disposed at the output terminal 30, providing the voltage Vh converted by the output current Iout flowing through the first resistor Rh to the protection circuit 70 shown in fig. 3, first amplifying the voltage Vh signal by a first-stage operational amplifier to obtain an output first current signal Isen, and then comparing the output first current signal Isen with the reference current i _ REF by using one of the comparison units of the protection circuit 70. If the first current signal Isen is greater than the reference current i _ REF, an overcurrent abnormality is detected at the output terminal 30, and therefore hardware protection needs to be started, at this time, the comparing unit outputs a high level signal, and a corresponding latch circuit in the protection circuit 70 is started, so that the protection circuit 70 outputs a fifth output signal Sout _ ocp with a high level to the first control switch Qsw 31. The following operations can be referred to the previous embodiments and are not described herein.
In summary, the description of the abnormal conditions of the power supply unit 10, the battery unit 20 and the output terminal 30 is mainly to control the third switch 13 and the abnormal indication unit 50 by the control signal corresponding to the abnormal type generated by the protection circuit 70 (i.e. the hardware architecture), so that when any abnormal condition occurs, the hardware protection is started, the third switch 13 is turned off and the abnormal indication unit 50 is operated, so that the operator can immediately find the system abnormality and can quickly deal with the abnormality.
In the following, a description will be given of the start of software protection (i.e., control by the controller 40) when an abnormal condition occurs. Fig. 2 is a system block diagram of a second embodiment of the uninterruptible power supply system according to the present invention. As shown in fig. 2, the system architecture is substantially the same as that of fig. 1, and therefore, the description thereof is omitted.
As shown in FIG. 2, the controller 40 receives at least one detection signal and directly outputs the third switch signal SW3 to control the third switch 13 to be turned off and directly outputs the sixth switch signalNumber SW6 controlling a third control switch QBAZAnd is turned on to operate the abnormality indication unit 50. The detection signals include a first voltage signal pu _ vs2 corresponding to the power supply unit 10, a second voltage signal bat _ vs2 corresponding to the battery unit 20, a third voltage signal out _ vs2 corresponding to the output terminal 30, and a current signal out _ is corresponding to the output terminal 30, as shown in the corresponding relationship in the following table.
Origin of abnormality Abnormal class Corresponding control signal
Power supply unit Occurrence of under-voltage abnormality First voltage signal pu _ vs2
Power supply unit Occurrence of overvoltage abnormality First voltage signal pu _ vs2
Battery unit Occurrence of under-voltage abnormality Second voltage signal bat _ vs2
Output end Occurrence of under-voltage abnormality Third voltage signal out _ vs2
Output end Over-current generationAbnormality (S) Current signal out _ is
Specifically, the detection of the occurrence of the under-voltage abnormality in the power supply unit 10 is performed by outputting the power supply V through a voltage dividing circuit (shown in fig. 2) provided on the power supply unit 10 sidePUThe first voltage signal pu _ vs2 obtained by voltage division is provided to the controller 40, and the controller 40 compares the first voltage signal pu _ vs2 with an internally designed voltage value (i.e., less than a threshold voltage), determines that the power unit 10 has an abnormal under voltage, outputs a third switch signal SW3, and controls the second control switch Qsw32 to turn off (as shown in fig. 4), so as to control the third switch 13 to turn off, so that when the power unit 10 has an abnormal under voltage, the power unit 10 with an abnormal under voltage is prevented from supplying power to the system by turning off the third switch 13. In addition, refer to fig. 6, which is a block diagram of a circuit for controlling the abnormality indication unit in a software manner according to the present invention. When the power supply unit 10 has an under-voltage abnormality, the high-level sixth switch signal SW6 controls the third control switch Q simultaneouslyBAZOn, the abnormal indication unit 50 (for example, a buzzer) sounds to inform an operator that the power supply unit 10 is under-voltage abnormal.
Similarly, the overvoltage abnormality of the power supply unit 10 is detected by outputting the power supply V through a voltage dividing circuit (shown in fig. 2) provided on the power supply unit 10 sidePUThe first voltage signal pu _ vs2 obtained by voltage division is provided to the controller 40, and the controller 40 compares the first voltage signal pu _ vs2 with an internally designed voltage value (i.e., greater than a threshold voltage), determines that the power unit 10 has an overvoltage abnormality, outputs a third switch signal SW3, and controls the second control switch Qsw32 to turn off and further controls the third switch 13 to turn off. The following operations can be referred to the previous embodiments and are not described herein.
Similarly, the detection of the occurrence of the under-voltage abnormality of the battery cell 20 is performed by outputting the power source V through a voltage dividing circuit (shown in fig. 2) provided on the battery cell 20 sideBATA second voltage obtained by dividingThe signal bat _ vs2 is provided to the controller 40, and the controller 40 compares the second voltage signal bat _ vs2 with an internally designed voltage value (i.e., less than a threshold voltage), determines that an under-voltage abnormality occurs in the power unit 10, outputs the third switch signal SW3, and controls the second control switch Qsw32 to turn off and further controls the third switch 13 to turn off. The following operations can be referred to the previous embodiments and are not described herein.
Similarly, the detection of the abnormal under-voltage at the output terminal 30 is to provide the obtained third voltage signal out _ vs2 to the controller 40 through a voltage divider circuit (as shown in fig. 2) disposed at the output terminal 30, and the controller 40 compares the third voltage signal out _ vs2 with an internally designed voltage value (i.e., smaller than a threshold voltage), determines that the abnormal under-voltage occurs at the output terminal 30, outputs the third switch signal SW3, and controls the second control switch Qsw32 to turn off to control the third switch 13 to turn off. The following operations can be referred to the previous embodiments and are not described herein.
The detection of the overcurrent abnormality at the output terminal 30 is performed by supplying the voltage Vs converted by the output current Iout flowing through the second resistor Rs to the conversion circuit shown in fig. 8 (which is a circuit diagram for converting the output current detected at the output terminal into the detection signal) through the current detection circuit provided at the output terminal 30 (as shown in fig. 7) to convert the voltage Vs into the current signal out _ is. The converted current signal out _ is provided to the controller 40, and the controller 40 compares the current with an internally designed current value (i.e. greater than a critical current), determines that the output terminal 30 has an overcurrent abnormality, outputs a third switch signal SW3, and controls the second control switch Qsw32 to turn off, thereby controlling the third switch 13 to turn off. The following operations can be referred to the previous embodiments and are not described herein.
In summary, the present invention has the following features and advantages:
1. the protection mechanism can be implemented by software (such as the controller 40) and hardware (such as the protection circuit 70) to improve the power supply reliability and safety of the uninterruptible power supply system.
2. By the abnormality indication unit (e.g., buzzer) as a notification to the operator when an abnormal condition occurs, the operator can immediately find that the system is abnormal and can quickly perform a process.
The above-mentioned detailed description and drawings are only for the preferred embodiments of the present invention, and the features of the present invention are not limited thereto, but rather should be construed as limiting the scope of the present invention, and all the modifications and variations of the present invention are included in the scope of the present invention, and any changes and modifications within the scope of the present invention as those skilled in the art can easily conceive of them are encompassed by the present claims.

Claims (10)

1. An uninterruptible power supply system connected to a load, the load being powered by a power supply unit or a battery unit, the uninterruptible power supply system comprising:
an output terminal coupled to the load;
a first switch having a first terminal and a second terminal coupled to the power unit;
a second switch having a first terminal and a second terminal coupled to the battery unit;
a third switch having a first end coupled to the first end of the first switch and the first end of the second switch, and a second end coupled to the output end;
a controller; and
a protection circuit;
the controller controls the first switch and the third switch to be turned on and the second switch to be turned off during a first period when the power supply unit supplies power to the load, and controls the first switch to be turned off and the second switch and the third switch to be turned on during a second period when the battery unit supplies power to the load, wherein during the first period, if at least one of the power supply unit and the output terminal is abnormal, or during the second period, if at least one of the battery unit and the output terminal is abnormal, the third switch is turned off through at least one of the protection circuit and the controller.
2. The uninterruptible power supply system of claim 1, further comprising:
an abnormal indication unit coupled to the protection circuit and the controller;
when the power supply unit, the battery unit or the output end is abnormal, the abnormal indicating unit acts.
3. The uninterruptible power supply system of claim 1, wherein:
the abnormality of the power supply unit comprises an under-voltage abnormality or an over-voltage abnormality;
the abnormality of the battery unit comprises an under-voltage abnormality; and
the output terminal abnormality includes an under-voltage abnormality or an over-current abnormality.
4. The system according to claim 1, wherein the controller receives a plurality of detection signals and generates a switch signal to control the third switch to turn on or off according to the plurality of detection signals.
5. The system according to claim 4, wherein the detection signals include a first voltage signal corresponding to the power unit, a second voltage signal corresponding to the battery unit, a third voltage signal corresponding to the output terminal, and a first current signal.
6. The uninterruptible power supply system of claim 1, wherein the protection circuit comprises:
a first comparator for comparing a first voltage signal corresponding to the power supply unit with a first reference voltage to generate a first output signal, thereby determining whether the power supply unit has an overvoltage;
a second comparator for comparing the first voltage signal with a second reference voltage to generate a second output signal, thereby determining whether the power supply unit has an undervoltage;
a third comparator for comparing a second voltage signal corresponding to the battery unit with the first reference voltage to generate a third output signal, thereby determining whether the battery unit has an undervoltage;
a fourth comparator for comparing a third voltage signal corresponding to the output terminal with a third reference voltage to generate a fourth output signal, thereby determining whether under-voltage occurs at the output terminal; and
a fifth comparator for comparing a first current signal corresponding to the output terminal with a reference current to generate a fifth output signal, thereby determining whether the output terminal is over-current.
7. The uninterruptible power supply system of claim 6, further comprising:
a fourth switch, comprising:
a control terminal for receiving the first output signal, the second output signal, the third output signal, the fourth output signal and the fifth output signal; and
a first end; and
a fifth switch, comprising:
a control terminal electrically connected to the first terminal of the fourth switch; and
a first terminal electrically connected to the third switch.
8. The system according to claim 7, wherein the controller receives a plurality of detection signals and generates a switch signal according to the plurality of detection signals, and the control terminal of the fifth switch further receives the switch signal.
9. The system according to claim 8, wherein when the switch signal has a high logic level, or at least one of the first output signal, the second output signal, the third output signal, the fourth output signal, and the fifth output signal has a high logic level, the fifth switch is turned off to turn on the third switch.
10. The system of claim 8, further comprising a voltage divider generating circuit electrically connected to the output terminal, the voltage divider generating circuit generating a first voltage and a second voltage according to the output current of the output terminal, the first voltage corresponding to the first current signal, and the second voltage corresponding to a second current signal to be provided to the controller for determining whether the output terminal is over-current.
CN201911205184.4A 2019-11-29 2019-11-29 Uninterruptible power supply system Pending CN112886695A (en)

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